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Can humans sense Earth's magnetism? Human retina protein can function as light-sensitive magnetic sensor

Date:
June 21, 2011
Source:
University of Massachusetts Medical School
Summary:
New research shows that a protein expressed in the human retina can sense magnetic fields when implanted into Drosophila, reopening an area of sensory biology in humans for further exploration.

For migratory birds, the ability to sense Earth's magnetic field is crucial to navigating the long-distance voyages these animals undertake during migration. Humans, however, are widely assumed not to have an innate magnetic sense.
Credit: Shopartgallery.com / Fotolia

For migratory birds and sea turtles, the ability to sense Earth's magnetic field is crucial to navigating the long-distance voyages these animals undertake during migration. Humans, however, are widely assumed not to have an innate magnetic sense. Research published in Nature Communications this week by faculty at the University of Massachusetts Medical School shows that a protein expressed in the human retina can sense magnetic fields when implanted into Drosophila, reopening an area of sensory biology in humans for further exploration.

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In many migratory animals, the light-sensitive chemical reactions involving the flavoprotein cryptochrome (CRY) are thought to play an important role in the ability to sense Earth's magnetic field. In the case of Drosophila, previous studies from the Reppert laboratory have shown that the cryptochrome protein found in these flies can function as a light-dependent magnetic sensor.

To test whether the human cryptochrome 2 protein (hCRY2) has a similar magnetic sensory ability, Steven Reppert, MD, the Higgins Family Professor of Neuroscience and chair and professor of neurobiology, graduate student Lauren Foley, and Robert Gegear, PhD, a post doctoral fellow in the Reppert lab now an assistant professor of biology and biotechnology at Worcester Polytechnic Institute, created a transgenic Drosophila model lacking its native cryptochrome protein but expressing hCRY2 instead. Using a behavioral system Reppert's group previously developed, they showed that these transgenic flies were able to sense and respond to an electric-coil-generated magnetic field and do so in a light-dependent manner.

These findings demonstrate that hCRY2 has the molecular capability to function in a magnetic sensing system and may pave the way for further investigation into human magnetoreception. "Additional research on magneto sensitivity in humans at the behavioral level, with particular emphasis on the influence of magnetic field on visual function, rather than non-visual navigation, would be informative," wrote Reppert and his colleagues in the study.


Story Source:

The above story is based on materials provided by University of Massachusetts Medical School. Note: Materials may be edited for content and length.


Journal Reference:

  1. Lauren E. Foley, Robert J. Gegear, Steven M. Reppert. Human cryptochrome exhibits light-dependent magnetosensitivity. Nature Communications, 2011; 2: 356 DOI: 10.1038/ncomms1364

Cite This Page:

University of Massachusetts Medical School. "Can humans sense Earth's magnetism? Human retina protein can function as light-sensitive magnetic sensor." ScienceDaily. ScienceDaily, 21 June 2011. <www.sciencedaily.com/releases/2011/06/110621121319.htm>.
University of Massachusetts Medical School. (2011, June 21). Can humans sense Earth's magnetism? Human retina protein can function as light-sensitive magnetic sensor. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2011/06/110621121319.htm
University of Massachusetts Medical School. "Can humans sense Earth's magnetism? Human retina protein can function as light-sensitive magnetic sensor." ScienceDaily. www.sciencedaily.com/releases/2011/06/110621121319.htm (accessed October 31, 2014).

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